A loose spark plugs is definitely an issue... and it definitely could affect your performance.
Since you're near the 100 hour mark anyway.... I'd go ahead and replace all the plugs now, then see where you're at.
Torque spark plugs WITH A TORQUE WRENCH to 20 ft. lbs.
Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
Still consider myself a "Marine Apprentice" after 48 years (learn something new every day).
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